1. 阅读理解

Liu Jichen, 23, a student from Tsinghua University, has developed a WeChat mini-program called "Clear Your Plate". After a meal, users can open the mini-program and take a picture of their empty plates. Once the image is recognized by the AI (Artificial Intelligence), students can collect points and use them to buy gifts or purchase charity meals to children in poor rural areas.

Liu and his team, together with other organizations, launched the "Clear Your Plate" campaign in November for the third year. It has swept over 1, 017 universities across the country. The one-month campaign attracted almost 1. 6 million participants and collectively reduced food waste by 862 tons and carbon emissions(碳排放) by 3, 337 tons.

 "Technological innovation is a good way to reduce food waste," Liu thought. He organized a team of 20 members to work on the project at the end of 2017. To solve the AI's problem of identifying photos of empty plates, the team spent half a year collecting over 100, 000 samples in canteens and restaurants. In 2018, the mini-program was officially put into operation on Oct 16, World Food Day. They then launched a campaign later that year.

"There were so many unknowns in research and development. For our team members, the biggest challenge was whether we were confident enough to complete it," Liu said. They not only achieved their goal, but now, the mini-program has more than 5 million registered users, according to Liu. "We hope our efforts can start a new trend among the younger generation by encouraging them to cherish(珍惜) their food and develop the habit of thrift(节约)," Liu added.

1. （1） What can we know about the "Clear Your Plate" mini-program?

   A . It aims to put an end to waste and encourage thrift. B . Its 6 million users are mostly students. C . It helped reduce food waste by 3, 337 tons. D . It is an exchange of not wasting food for rewards.
3. （2） What challenge did Liu and his team face?

   A . They found it tough to promote the campaign. B . They felt uncertain whether they could complete the project. C . They lacked professional technical support. D . They had difficulty gathering enough samples.
5. （3） Which of the following best describes Liu Jichen?

   A . Optimistic and demanding. B . Generous and responsible. C . Talented and humorous. D . Creative and determined.
7. （4） Where is the text probably from?

   A . A guidebook. B . A news report. C . A book review. D . A textbook.